Landy, yes that argument is used by creationists but that does not mean it proves creation.
Sorry - I was referring to Fukitol's mini rant :D
Yes, I know irreducible complexity would be a reason to rethink evolution, but nothing of that nature has been discovered as yet. If it was, or even the hint if it, the creationists would be shouting it from the rooftops.
And here's the thing. If ever it was then the scientific establishment would learn from it and redefine the theory. That's the beauty of science - it's evidence driven.
You couldn't see religious fundamentalism doing that.